need working for the question 21.(a) A load receives 400 V through a transmission line. The line current is 20A. The powerfactor is 0.9. The transmission line has a resistance of 1 Q.(i) Calculate the power loss in the transmission line.(ii) Calculate the active power delivered to the load.(iii) Calculate the reactive power delivered to the load.(b) A single-phase transformer is rated at 200V/1000V. The secondary voltage of thetransformer is v(t) = 1400 cos (100nt + 7/3) V when a load of 100 2 is connected.(i) Calculate the primary RMS voltage.(ii) Calculate the load reflected on to the primary side.(iii) Calculate the power delivered to the load.(c) A DC motor, which is supplied by a 30 V DC power source, is operating at a constantmotor speed of 600 rpm. The motor has an armature resistance of 0.2 and a back-emf of 28 V. Determine the following:(i) The current drawn by the motor.(ii) The torque produced by the motor.(iii) The power loss in the armature.

(a) A load receives 400 V through a transmission line. The line current is 20A. The power factor is 0.9. The transmission line has a resistance of 1 Q. (i) Calculate the power loss in the transmission line. (ii) Calculate the active power delivered to the load. (iii) Calculate the reactive power delivered to the load.

(a) A load receives 400 V through a transmission line. The line current is 20A. The power factor is 0.9. The transmission line has a resistance of 1 Q. (i) Calculate the power loss in the transmission line. (ii) Calculate the active power delivered to the load. (iii) Calculate the reactive power delivered to the load.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.63P: A 23/230-kV step-up transformer feeds a three-phase transmission line, which in turn supplies a...

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A 23/230-kV step-up transformer feeds a three-phase transmission line, which in turn supplies a 150-MVA,0.8 lagging power factor load through a step-down 230/23-kV transformer. The impedance of the line and transformers at 230kVis18+j60. Determine the tap setting for each transformer to maintain the voltage at the load at 23 kV.
A 25 kVA, 2 kV(rms)/100 V(rms) single phase transformer is connected between a 120 V(rms) utility supply and a resistive load. The load current was measured to be 20 A(rms). i. Determine the active power of the load. ii. Determine the primary RMS current. iii. Determine the equivalent resistance of the transformer as seen by the utility supply.
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